/*******************************************************************************
 * Copyright 2010 DemandSpot
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *   http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 ******************************************************************************/
package com.demandspot.client.analytics;

import com.google.gwt.user.client.Command;
import com.google.gwt.user.client.DeferredCommand;

public class GoogleAnalyticsAPI {
	
	public static void track(final String category, final String action) {
		track(category, action, null);
	}
	
	public static void track(final String category, final String action, final String label) {
		track(category, action, label, 0);
	}
	
	public static void track(final String category, final String action, final String label, final int value) {
		DeferredCommand.addCommand(new Command() {
			public void execute() {
				if (label == null) {
					trackNative(category, action);
				}
				else if (value == 0) {
					trackNative(category, action, label);
				}
				else {
					trackNative(category, action, label, value);
				}
			}			
		});		
	}
	
	public static void trackPage(String page) {
		trackPageNative(page);		
	}
	
	private static native void trackPageNative(String page) /*-{
		if ($wnd.pageTracker) {
			$wnd.pageTracker._trackPageview(page);
		}
	}-*/;
	
	//http://code.google.com/apis/analytics/docs/eventTrackerGuide.html
	private static native void trackNative(String category, String action) /*-{
		if ($wnd.pageTracker) {
			$wnd.pageTracker._trackEvent(category, action)			
		}
	}-*/;
	
	private static native void trackNative(String category, String action, String label) /*-{
		if ($wnd.pageTracker) {
			$wnd.pageTracker._trackEvent(category, action, label)			
		}
	}-*/;
	
	private static native void trackNative(String category, String action, String label, int value) /*-{
		if ($wnd.pageTracker) {
			$wnd.pageTracker._trackEvent(category, action, label, value)
		}
	}-*/;
	

	
	
	
}
